摘要：为了拓展聚丙烯材料的应用，在对 CaCO₃ 粉体进行表面偶 联处理后,混入聚丙烯中,制成聚丙烯 /CaCO₃ 复合材料。通过透射电 镜、X 射线衍射仪、偏光显微镜、电子万能试验机等仪器设备研究了 样品的显微组织及其力学性能。结果表明：CaCO₃ 粉体有异相成核剂 的作用，使球晶尺寸变小，结晶度有所提高，在聚丙烯基体中产生明 显的增强增韧效果。经改性后的聚丙烯/CaCO₃ 复合材料显微组织得 到改善,力学性能有所提高。 

关键词：CaCO₃ 粉体；聚丙烯；显微组织；力学性能

Abstract：CaCO₃ powder was modified by surface treatment agent and mixed into polypropylene , then a new polypropylene / CaCO₃composites was made. The microstructure and mechanical properties of the composite were studied by TEM, XRD, microscope and electronic all-purpose machine etc. The results showed that the CaCO₃ powder had heterogeneous nucleation functions, made spherulites' size smaller, improved crystallize, produced obvious reinforcing and toughening effect in polypropylene matrix. The microstructure and mechanical properties of polypropylene/ CaCO₃ composites had been improved. 

Keywords： CaCO₃ powder ; polypropylene ; microstructure; mechanical property